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During the Clan Invasion the First learned that their sister regiments had been destroyed by the Clans. They wanted to avenge their fallen comrades, but were restricted to garrison duty by the Truce of Tukayyid. To appease their honor, the First was assigned to raid several worlds in the Clan occupation zone. They raided Cyrenaica, Irece, and Avon. These raids were intended to disrupt any Clan invasion plans by seizing or destroying Clan supply depots. These raids were frequently successful, and the First inflicted heavy losses on the garrison units on those worlds as well.[3]

Faced off against the Word of Blake on Atria in the early 3070's. They rotated to Dromini VI in 3073 and faced the Blakists a month later. The First Amphigean destroyed half the Blakist's DropShips with artillery fire, and continued to sting the invaders for months. Shortly before Operation SCOUR started, the High Command reinforced the First with infantry and armor assets.[6]

The First continued to hold the Combine-Blakist Protectorate border throughout Operation SCOUR, and after the Jihad ended. At the end of the Jihad the unit had been reduced to two battalions, but they realized that the Quartermaster wouldn't send them replacements. The First sent technical and recovery teams to battlefields in nearby systems, and recovered nearly a company of 'Mechs. They spent the next few years acquiring new warriors and equipment and by 3085 they had rebuilt to regimental strength.[7]

The First Amphigean LAG uses their high speed to engage an enemy force and then withdraws, encouraging their opponent to follow them. Enemies who do follow the retreating Amphigeans are typically ambushed by other Amphigean forces stationed nearby. After 3055 the First Amphigean used the same tactics, but Tai-sas Trueffeau and Two-Feathers would split the unit into two units. Against enemies who assumed they were facing the entire unit, this tactic of splitting up allowed the Amphigeans to hit the enemy in the flank or rear.[3]